ARGZ_ADD(3)		   Linux Programmer's Manual		   ARGZ_ADD(3)

NAME
       argz_add, argz_add_sep, argz_append, argz_count, argz_create, argz_cre‐
       ate_sep,	   argz_delete,	   argz_extract,    argz_insert,    argz_next,
       argz_replace, argz_stringify - functions to handle an argz list

SYNOPSIS
       #include <argz.h>

       error_t argz_add(char **argz, size_t *argz_len, const char *str);

       error_t argz_add_sep(char **argz, size_t *argz_len,
			    const char *str, int delim);

       error_t argz_append(char **argz, size_t *argz_len,
			    const char *buf, size_t buf_len);

       size_t argz_count(const char *argz, size_t argz_len);

       error_t argz_create(char * const argv[], char **argz,
			    size_t *argz_len);

       error_t argz_create_sep(const char *str, int sep, char **argz,
			    size_t *argz_len);

       error_t argz_delete(char **argz, size_t *argz_len, char *entry);

       void argz_extract(char *argz, size_t argz_len, char  **argv);

       error_t argz_insert(char **argz, size_t *argz_len, char *before,
			    const char *entry);

       char *argz_next(char *argz, size_t argz_len, const char *entry);

       error_t argz_replace(char **argz, size_t *argz_len, const char *str,
			    const char *with, unsigned int *replace_count);

       void argz_stringify(char *argz, size_t len, int sep);

DESCRIPTION
       These functions are glibc-specific.

       An  argz	 vector	 is  a	pointer	 to a character buffer together with a
       length.	The intended interpretation of	the  character	buffer	is  an
       array of strings, where the strings are separated by null bytes ('\0').
       If the length is nonzero, the last byte of the buffer must  be  a  null
       byte.

       These functions are for handling argz vectors.  The pair (NULL,0) is an
       argz vector, and, conversely, argz vectors of length 0 must  have  NULL
       pointer.	  Allocation of nonempty argz vectors is done using malloc(3),
       so that free(3) can be used to dispose of them again.

       argz_add() adds the string str at the  end  of  the  array  *argz,  and
       updates *argz and *argz_len.

       argz_add_sep()  is  similar,  but splits the string str into substrings
       separated by the delimiter delim.  For example, one might use this on a
       UNIX search path with delimiter ':'.

       argz_append()	appends	  the	argz   vector	(buf, buf_len)	 after
       (*argz, *argz_len) and updates *argz and *argz_len.   (Thus,  *argz_len
       will be increased by buf_len.)

       argz_count()  counts the number of strings, that is, the number of null
       bytes ('\0'), in (argz, argz_len).

       argz_create() converts a UNIX-style argument vector argv, terminated by
       (char *) 0, into an argz vector (*argz, *argz_len).

       argz_create_sep()  converts the null-terminated string str into an argz
       vector (*argz, *argz_len) by breaking it up at every occurrence of  the
       separator sep.

       argz_delete()  removes  the substring pointed to by entry from the argz
       vector (*argz, *argz_len) and updates *argz and *argz_len.

       argz_extract() is the opposite of argz_create().	  It  takes  the  argz
       vector  (argz, argz_len)	 and  fills  the  array	 starting at argv with
       pointers to the substrings, and a final NULL, making a UNIX-style  argv
       vector.	 The array argv must have room for argz_count(argz,argz_len) +
       1 pointers.

       argz_insert() is the opposite of argz_delete().	It inserts  the	 argu‐
       ment  entry  at position before into the argz vector (*argz, *argz_len)
       and updates *argz and *argz_len.	 If before is NULL,  then  entry  will
       inserted at the end.

       argz_next()  is a function to step trough the argz vector.  If entry is
       NULL, the first entry is returned.  Otherwise, the entry	 following  is
       returned.  It returns NULL if there is no following entry.

       argz_replace()  replaces each occurrence of str with with, reallocating
       argz as necessary.  If replace_count is non-NULL,  *replace_count  will
       be incremented by the number of replacements.

       argz_stringify()	 is  the opposite of argz_create_sep().	 It transforms
       the argz vector into a normal string by replacing all null bytes ('\0')
       except the last by sep.

RETURN VALUE
       All  argz  functions  that  do  memory allocation have a return type of
       error_t, and return 0 for success, and ENOMEM if	 an  allocation	 error
       occurs.

CONFORMING TO
       These functions are a GNU extension.  Handle with care.

BUGS
       Argz  vectors  without a terminating null byte may lead to Segmentation
       Faults.

SEE ALSO
       envz_add(3)

COLOPHON
       This page is part of release 3.53 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

				  2007-05-18			   ARGZ_ADD(3)

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